/* ============================================================
   LAYOUT.CSS — EcoBuild Studio
   Container, Grid, Section, Header/Footer Layout, Responsive
   ============================================================ */

/* ---------- CONTAINER ---------- */
.container {
    width: 100%;
    max-width: 1320px;
    margin-inline: auto;
    padding-inline: var(--space-md);
}
.container--sm    { max-width: 720px; }
.container--md    { max-width: 960px; }
.container--lg    { max-width: 1140px; }
.container--xl    { max-width: 1320px; }
.container--2xl   { max-width: 1536px; }
.container--full  { max-width: 100%; }

/* ---------- SECTION ---------- */
.section {
    position: relative;
    padding-block: var(--section-py);
    overflow: hidden;
}
.section--no-pb   { padding-bottom: 0; }
.section--no-pt   { padding-top: 0; }
.section--compact { padding-block: calc(var(--section-py) * 0.6); }
.section--tall    { padding-block: calc(var(--section-py) * 1.3); }

/* Section backgrounds */
.section--bg-alt    { background-color: var(--clr-bg-alt); }
.section--bg-dark   { background-color: var(--clr-black); color: var(--clr-white); }
.section--bg-primary{ background-color: var(--clr-primary); color: var(--clr-white); }

/* Section Header (Title + Subtitle) */
.section-header {
    text-align: center;
    max-width: 720px;
    margin-inline: auto;
    margin-bottom: var(--space-2xl);
}
.section-header__label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--ff-body);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    text-transform: uppercase;
    letter-spacing: var(--ls-widest);
    color: var(--clr-primary);
    margin-bottom: var(--space-sm);
}
.section-header__label::before,
.section-header__label::after {
    content: '';
    width: 28px;
    height: 1.5px;
    background: var(--clr-primary);
    flex-shrink: 0;
}
.section-header__title {
    font-family: var(--ff-heading);
    font-size: var(--fs-h2);
    font-weight: var(--fw-bold);
    line-height: var(--lh-tight);
    color: var(--clr-text);
    margin-bottom: var(--space-sm);
}
.section-header__desc {
    font-size: var(--fs-lg);
    color: var(--clr-text-muted);
    line-height: var(--lh-normal);
    max-width: 600px;
    margin-inline: auto;
}

/* Inverted section header (on dark backgrounds) */
.section--bg-dark .section-header__label,
.section--bg-primary .section-header__label {
    color: var(--clr-secondary-light);
}
.section--bg-dark .section-header__label::before,
.section--bg-dark .section-header__label::after,
.section--bg-primary .section-header__label::before,
.section--bg-primary .section-header__label::after {
    background: var(--clr-secondary-light);
}
.section--bg-dark .section-header__title,
.section--bg-primary .section-header__title {
    color: var(--clr-white);
}
.section--bg-dark .section-header__desc,
.section--bg-primary .section-header__desc {
    color: rgba(255,255,255,0.7);
}

/* ---------- GRID SYSTEM ---------- */
.grid {
    display: grid;
    gap: var(--space-lg);
}
.grid--2   { grid-template-columns: repeat(2, 1fr); }
.grid--3   { grid-template-columns: repeat(3, 1fr); }
.grid--4   { grid-template-columns: repeat(4, 1fr); }
.grid--5   { grid-template-columns: repeat(5, 1fr); }
.grid--6   { grid-template-columns: repeat(6, 1fr); }

/* Auto-fit responsive grids */
.grid--auto-sm  { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.grid--auto-md  { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--auto-lg  { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }

/* Grid gap variants */
.grid--gap-sm   { gap: var(--space-sm); }
.grid--gap-md   { gap: var(--space-md); }
.grid--gap-lg   { gap: var(--space-lg); }
.grid--gap-xl   { gap: var(--space-xl); }
.grid--gap-2xl  { gap: var(--space-2xl); }
.grid--gap-0    { gap: 0; }

/* Grid alignment */
.grid--center      { align-items: center; }
.grid--start       { align-items: start; }
.grid--end         { align-items: end; }
.grid--stretch     { align-items: stretch; }

/* ---------- FLEX LAYOUT ---------- */
.flex              { display: flex; }
.flex--inline      { display: inline-flex; }
.flex--wrap        { flex-wrap: wrap; }
.flex--col         { flex-direction: column; }
.flex--row         { flex-direction: row; }
.flex--center      { align-items: center; justify-content: center; }
.flex--between     { justify-content: space-between; }
.flex--evenly      { justify-content: space-evenly; }
.flex--start       { justify-content: flex-start; }
.flex--end         { justify-content: flex-end; }
.flex--align-start { align-items: flex-start; }
.flex--align-center{ align-items: center; }
.flex--align-end   { align-items: flex-end; }
.flex--gap-xs      { gap: var(--space-xs); }
.flex--gap-sm      { gap: var(--space-sm); }
.flex--gap-md      { gap: var(--space-md); }
.flex--gap-lg      { gap: var(--space-lg); }
.flex--gap-xl      { gap: var(--space-xl); }

/* ---------- SPLIT LAYOUT (Two Column) ---------- */
.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}
.split--reverse > :first-child { order: 2; }
.split--reverse > :last-child  { order: 1; }
.split--60-40 { grid-template-columns: 1.5fr 1fr; }
.split--40-60 { grid-template-columns: 1fr 1.5fr; }
.split--70-30 { grid-template-columns: 2.3fr 1fr; }
.split--30-70 { grid-template-columns: 1fr 2.3fr; }

/* ---------- PAGE BANNER ---------- */
.page-banner {
    position: relative;
    min-height: clamp(250px, 30vh, 400px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background-color: var(--clr-primary-dark);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding-top: calc(var(--header-height) + var(--space-xl));
    padding-bottom: var(--space-xl);
}
.page-banner::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--clr-overlay-heavy);
    z-index: 1;
}
.page-banner__content {
    position: relative;
    z-index: 2;
}
.page-banner__title {
    font-family: var(--ff-heading);
    font-size: var(--fs-h1);
    font-weight: var(--fw-bold);
    color: var(--clr-white);
    margin-bottom: var(--space-sm);
}
.page-banner__subtitle {
    font-size: var(--fs-lg);
    color: rgba(255,255,255,0.75);
}

/* ---------- MAIN CONTENT ---------- */
main {
    min-height: calc(100vh - var(--header-height));
}

/* Content with sidebar */
.content-area {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: var(--space-2xl);
    align-items: start;
}
.content-area--reverse {
    grid-template-columns: 340px 1fr;
}

/* ---------- HEADER LAYOUT ---------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-sticky);
    height: var(--header-height);
    display: flex;
    align-items: center;
    background: transparent;
    transition: background var(--dur-normal) ease,
                box-shadow var(--dur-normal) ease,
                height var(--dur-normal) ease;
}
.header.header--scrolled {
    background: var(--header-bg-scroll);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-md);
    height: 70px;
}
.header .container {
    width: 100%;
}

/* Nav wrapper (flex row: logo | links | actions) */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

/* Logo */
.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--ff-heading);
    font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.6rem);
    font-weight: var(--fw-bold);
    color: var(--clr-white);
    transition: color var(--dur-fast) ease;
    flex-shrink: 0;
}
.header.header--scrolled .nav__logo {
    color: var(--clr-text);
}
.nav__logo img {
    height: clamp(32px, 2.5vw, 44px);
    width: auto;
}

/* Desktop Navigation List */
.nav__list {
    display: flex;
    align-items: center;
    gap: 0;
}
.nav__item {
    position: relative;
}
.nav__link {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    color: rgba(255,255,255,0.85);
    letter-spacing: var(--ls-wide);
    transition: color var(--dur-fast) ease;
    white-space: nowrap;
}
.nav__link:hover,
.nav__link.active {
    color: var(--clr-white);
}
.header.header--scrolled .nav__link {
    color: var(--clr-text-secondary);
}
.header.header--scrolled .nav__link:hover,
.header.header--scrolled .nav__link.active {
    color: var(--clr-primary);
}

/* Mega Menu */
.mega-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--space-lg);
    min-width: 520px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--dur-fast) ease,
                transform var(--dur-fast) ease,
                visibility var(--dur-fast) ease;
    z-index: var(--z-dropdown);
    display: none;
}
.nav__item--mega:hover > .mega-menu,
.nav__item--mega.active > .mega-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
    display: block;
}
.mega-menu__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xs);
}
.mega-menu__item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: background var(--dur-fast) ease;
}
.mega-menu__item a {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    width: 100%;
}
.mega-menu__item:hover {
    background: var(--clr-surface-hover);
}
.mega-menu__item i {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: rgba(var(--clr-primary-rgb), 0.1);
    color: var(--clr-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1rem;
}
.mega-menu__item h4 {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--clr-text);
    margin-bottom: 2px;
}
.mega-menu__item p {
    font-size: var(--fs-xs);
    color: var(--clr-text-muted);
    line-height: var(--lh-snug);
}
.mega-menu__item--cta {
    grid-column: 1 / -1;
    justify-content: center;
    padding-top: var(--space-sm);
    border-top: 1px solid var(--clr-border-light);
    margin-top: var(--space-xs);
}

/* Nav Actions (theme toggle + CTA + hamburger) */
.nav__actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-shrink: 0;
}

/* Theme Toggle */
.theme-toggle {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.85);
    transition: var(--transition);
    cursor: pointer;
    font-size: 1.1rem;
}
.theme-toggle:hover {
    background: rgba(255,255,255,0.12);
    color: var(--clr-white);
}
.header.header--scrolled .theme-toggle {
    color: var(--clr-text-secondary);
}
.header.header--scrolled .theme-toggle:hover {
    background: var(--clr-surface-hover);
    color: var(--clr-primary);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.9);
    font-size: 1.4rem;
    transition: var(--transition);
    cursor: pointer;
}
.mobile-menu-toggle:hover {
    background: rgba(255,255,255,0.12);
}
.header.header--scrolled .mobile-menu-toggle {
    color: var(--clr-text);
}
.header.header--scrolled .mobile-menu-toggle:hover {
    background: var(--clr-surface-hover);
}

/* ===== MOBILE MENU (Slide-in Drawer) ===== */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(85vw, 380px);
    height: 100vh;
    background: var(--clr-bg-card);
    z-index: calc(var(--z-overlay) + 10);
    transition: right var(--dur-normal) var(--ease-out);
    overflow-y: auto;
    box-shadow: var(--shadow-2xl);
    display: flex;
    flex-direction: column;
}
.mobile-menu.active {
    right: 0;
}
/* Backdrop */
.mobile-menu-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--clr-overlay);
    z-index: var(--z-overlay);
    opacity: 0;
    transition: opacity var(--dur-normal) ease;
}
.mobile-menu-backdrop.active {
    opacity: 1;
}
body.menu-open {
    overflow: hidden;
}

.mobile-menu__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--clr-border-light);
    flex-shrink: 0;
}
.mobile-menu__logo img {
    height: 36px;
    width: auto;
}
.mobile-menu__close {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: var(--clr-text-secondary);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}
.mobile-menu__close:hover {
    background: var(--clr-surface-hover);
    color: var(--clr-text);
}

.mobile-menu__nav {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    overflow-y: auto;
}
.mobile-menu__list {
    margin-bottom: var(--space-lg);
}
.mobile-menu__item {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    border-bottom: 1px solid var(--clr-border-light);
}
.mobile-menu__item > a {
    flex: 1;
    padding: var(--space-sm) 0;
    font-size: var(--fs-base);
    font-weight: var(--fw-medium);
    color: var(--clr-text);
    transition: color var(--dur-fast) ease;
}
.mobile-menu__item > a:hover {
    color: var(--clr-primary);
}
.mobile-menu__toggle {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: var(--fw-bold);
    color: var(--clr-text-muted);
    cursor: pointer;
    transition: var(--transition);
}
.mobile-menu__toggle:hover {
    background: var(--clr-surface-hover);
    color: var(--clr-primary);
}
.mobile-menu__item.active .mobile-menu__toggle {
    transform: rotate(45deg);
    color: var(--clr-primary);
}
.mobile-menu__submenu {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--dur-normal) ease;
    padding-left: var(--space-md);
}
.mobile-menu__submenu li {
    border-bottom: 1px solid var(--clr-border-light);
}
.mobile-menu__submenu li:last-child {
    border-bottom: none;
}
.mobile-menu__submenu a {
    display: block;
    padding: var(--space-xs) 0;
    font-size: var(--fs-sm);
    color: var(--clr-text-secondary);
    transition: color var(--dur-fast) ease;
}
.mobile-menu__submenu a:hover,
.mobile-menu__submenu .view-all {
    color: var(--clr-primary);
}

.mobile-menu__cta {
    margin-bottom: var(--space-lg);
}
.mobile-menu__contact {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--clr-border-light);
}
.mobile-menu__contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--fs-sm);
    color: var(--clr-text-secondary);
    transition: color var(--dur-fast) ease;
}
.mobile-menu__contact-item:hover {
    color: var(--clr-primary);
}
.mobile-menu__contact-item i {
    color: var(--clr-primary);
    font-size: 1rem;
    flex-shrink: 0;
}

/* ---------- FOOTER LAYOUT ---------- */
.site-footer {
    background: var(--clr-black);
    color: rgba(255,255,255,0.8);
    padding-top: var(--space-3xl);
    position: relative;
    overflow: hidden;
}
.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--clr-primary), var(--clr-secondary), var(--clr-accent));
}
.footer-top {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: var(--space-2xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand {
    max-width: 320px;
}
.footer-brand__logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--ff-heading);
    font-size: 1.4rem;
    font-weight: var(--fw-bold);
    color: var(--clr-white);
    margin-bottom: var(--space-md);
}
.footer-brand__text {
    font-size: var(--fs-sm);
    color: rgba(255,255,255,0.55);
    line-height: var(--lh-relaxed);
    margin-bottom: var(--space-lg);
}
.footer-social {
    display: flex;
    gap: var(--space-xs);
}
.footer-social__link {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(255,255,255,0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.6);
    font-size: 0.95rem;
    transition: var(--transition);
}
.footer-social__link:hover {
    background: var(--clr-primary);
    border-color: var(--clr-primary);
    color: var(--clr-white);
    transform: translateY(-2px);
}

/* Footer Columns */
.footer-col__title {
    font-family: var(--ff-body);
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
    color: var(--clr-white);
    margin-bottom: var(--space-lg);
    letter-spacing: var(--ls-wide);
}
.footer-col__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}
.footer-col__link {
    font-size: var(--fs-sm);
    color: rgba(255,255,255,0.5);
    transition: color var(--dur-fast) ease, padding-left var(--dur-fast) ease;
}
.footer-col__link:hover {
    color: var(--clr-primary-light);
    padding-left: 6px;
}
.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}
.footer-contact-item i {
    color: var(--clr-primary-light);
    margin-top: 3px;
    flex-shrink: 0;
    width: 16px;
    text-align: center;
}
.footer-contact-item span {
    font-size: var(--fs-sm);
    color: rgba(255,255,255,0.55);
    line-height: var(--lh-normal);
}
.footer-contact-item a {
    color: rgba(255,255,255,0.55);
    transition: color var(--dur-fast) ease;
}
.footer-contact-item a:hover {
    color: var(--clr-primary-light);
}

/* Newsletter in footer */
.footer-newsletter {
    margin-top: var(--space-lg);
}
.footer-newsletter__form {
    display: flex;
    gap: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.12);
}
.footer-newsletter__input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: rgba(255,255,255,0.06);
    color: var(--clr-white);
    font-size: var(--fs-sm);
    min-width: 0;
}
.footer-newsletter__input::placeholder {
    color: rgba(255,255,255,0.35);
}
.footer-newsletter__btn {
    padding: var(--space-sm) var(--space-md);
    background: var(--clr-primary);
    color: var(--clr-white);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    transition: background var(--dur-fast) ease;
    white-space: nowrap;
}
.footer-newsletter__btn:hover {
    background: var(--clr-primary-dark);
}

/* Footer Bottom */
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: var(--space-lg);
    font-size: var(--fs-xs);
    color: rgba(255,255,255,0.35);
}
.footer-bottom__links {
    display: flex;
    gap: var(--space-md);
}
.footer-bottom__links a {
    color: rgba(255,255,255,0.35);
    transition: color var(--dur-fast) ease;
}
.footer-bottom__links a:hover {
    color: rgba(255,255,255,0.7);
}

/* ---------- BACK TO TOP ---------- */
.back-to-top {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--clr-primary);
    color: var(--clr-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-sticky);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    cursor: pointer;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    background: var(--clr-primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   Mobile-first: 320px → 576px → 768px → 1024px → 1280px → 
                 1440px → 1920px → 2560px+
   ============================================================ */

/* --- Up to 576px (Mobile Portrait) --- */
@media (max-width: 576px) {
    .container { padding-inline: var(--space-sm); }

    .grid--2, .grid--3, .grid--4, .grid--5, .grid--6 {
        grid-template-columns: 1fr;
    }
    .split,
    .split--60-40, .split--40-60,
    .split--70-30, .split--30-70 {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    .split--reverse > :first-child { order: 0; }
    .split--reverse > :last-child  { order: 0; }

    .content-area,
    .content-area--reverse {
        grid-template-columns: 1fr;
    }

    .section-header { margin-bottom: var(--space-xl); }

    /* Footer */
    .footer-top {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
    .footer-bottom__links { justify-content: center; }

    .back-to-top { width: 42px; height: 42px; right: var(--space-md); bottom: var(--space-md); }
}

/* --- 577px to 768px (Mobile Landscape / Small Tablet) --- */
@media (min-width: 577px) and (max-width: 768px) {
    .grid--3, .grid--4, .grid--5, .grid--6 {
        grid-template-columns: repeat(2, 1fr);
    }
    .split,
    .split--60-40, .split--40-60,
    .split--70-30, .split--30-70 {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    .content-area,
    .content-area--reverse {
        grid-template-columns: 1fr;
    }
    .footer-top {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }
}

/* --- Up to 1024px (Tablet and below) --- */
@media (max-width: 1024px) {
    /* Show mobile toggle, hide desktop nav list */
    .mobile-menu-toggle { display: flex; }
    .nav__list { display: none; }
    .nav__cta { display: none; }

    /* Footer */
    .footer-top {
        grid-template-columns: 1fr 1fr;
    }
    .footer-brand { max-width: 100%; }
}

/* --- 769px to 1024px (Tablet) --- */
@media (min-width: 769px) and (max-width: 1024px) {
    .grid--4 { grid-template-columns: repeat(2, 1fr); }
    .grid--5 { grid-template-columns: repeat(3, 1fr); }
    .grid--6 { grid-template-columns: repeat(3, 1fr); }

    .content-area { grid-template-columns: 1fr 280px; }
    .content-area--reverse { grid-template-columns: 280px 1fr; }
}

/* --- 1025px to 1279px (Small Desktop) --- */
@media (min-width: 1025px) and (max-width: 1279px) {
    .grid--5 { grid-template-columns: repeat(3, 1fr); }
    .grid--6 { grid-template-columns: repeat(4, 1fr); }
}

/* --- 1280px+ (Desktop) --- */
@media (min-width: 1280px) {
    .container { padding-inline: var(--space-lg); }
}

/* --- 1441px to 1920px (Large Desktop) --- */
@media (min-width: 1441px) {
    .container    { max-width: 1400px; }
    .container--2xl { max-width: 1680px; }
}

/* --- 1921px to 2560px (2K / QHD) --- */
@media (min-width: 1921px) {
    .container    { max-width: 1600px; }
    .container--2xl { max-width: 1920px; }

    .footer-top { grid-template-columns: 1.5fr 1fr 1fr 1.3fr; gap: var(--space-3xl); }
}

/* --- 2561px+ (4K and Ultra-wide) --- */
@media (min-width: 2561px) {
    html { font-size: 22px; }
    .container    { max-width: 1920px; }
    .container--2xl { max-width: 2200px; }

    .site-header { height: 96px; }
    .site-header.scrolled { height: 84px; }
    .site-logo { font-size: 1.8rem; }
    .site-nav__link { font-size: var(--fs-base); padding: var(--space-sm) var(--space-md); }
    .theme-toggle { width: 50px; height: 50px; font-size: 1.3rem; }
    .back-to-top { width: 56px; height: 56px; font-size: 1.3rem; }
}

/* --- Print --- */
@media print {
    .site-header, .site-footer, .back-to-top, .scroll-progress,
    .preloader, .mobile-toggle, .mobile-overlay { display: none !important; }
    body { color: #000; background: #fff; }
    a { color: #000; text-decoration: underline; }
}